INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period			$ (192)
(Addition to) release of allowance for credit losses	$ (2)	$ (12)	(33)	$ 4
Balance, end of period	(225)		(225)
Balance, beginning of period			(7)
(Addition to) release of allowance for credit losses	0	0	1	0
Balance, end of period	(5)		(5)
Balance, beginning of period			0
Balance, end of period	0		0
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(65)	(52)	(54)	(68)
(Addition to) release of allowance for credit losses	(11)	(1)	(22)	15
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	(76)	(53)	(76)	(53)
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(9)	(8)	(9)	(10)
(Addition to) release of allowance for credit losses	0	0	0	2
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	(9)	(8)	(9)	(8)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(149)	(98)	(129)	(96)
(Addition to) release of allowance for credit losses	9	(16)	(11)	(18)
Write-offs, net of recoveries	0	5	0	5
Change in foreign exchange	0	0	0	0
Balance, end of period	(140)	(109)	(140)	(109)
Held-to-maturity securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(6)	(8)	(7)	(8)
(Addition to) release of allowance for credit losses	0	0	1	0
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	1	1	1	1
Balance, end of period	(5)	(7)	(5)	(7)
Available-for-sale securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	0	0	0	0
(Addition to) release of allowance for credit losses	0	0	0	0
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	0	0	0	0
Reinsurance recoverables
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(11)	(9)	(8)	(13)
(Addition to) release of allowance for credit losses)	0	0	(2)	2
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	1	1	0	3
Balance, end of period	$ (10)	$ (8)	$ (10)	$ (8)